Natural English - 'Connected Speech '
Many foreigners with a good knowledge of English still find it difficult to understand native-speakers, because they 'speak too fast' . Yes this is true, but there are other reasons why it can be difficult to understand a native-speaker.
These are some of the reasons why:
1) THE SCHWA - UNSTRESSED SYLLABLES
The Schwa indicates an unstressed syllable. In language some syllables are stressed and others are unstressed. For example, in the word BANANA, there are 2 unstressed syllables. Therefore it is not spoken as BA-NA-NA, but BU-NA-NU, with the stress on the second syllable.
So, where is the schwa sound in these words ?
DOCTOR, TOMORROW, SUMMER,
Schwa sounds also appear within sentences when we speak fast.
For example, in the sentence IT'S FOR YOU. the word FOR becomes FU. In effect we say 'Its f ' you'
Look at this sentence ' HOW ABOUT A CUP OF TEA' . When we say this quickly it becomes ' How about a cup u' tea'
So, where do you think the Schwa sound appears here ? - 'I WAS GOING TO TELL YOU' or this 'WHERE ARE YOU GOING TONIGHT ?'
2) LINKING - CATENATION
here the end of one word joins the beginning of the next. For example ' IS HE BUSY' becomes 'IS-E BUSY?' or 'THIS ORANGE' becomes 'THISORANGE'
This is where when 2 words are spoken quickly, a second sound appears.
For example ; 'DO IT' when spoken quickly becomes 'DO WIT' . To make pronunciation easier a W sound appears in natural speech. In the same way, GO OUT becomes GOWOUT
This is where a sound disappears. For example 'NEXT DOOR' becomes NEXDOOR, where the T tends to disappear in natural speech. Another example ' MOST COMMON' becomes MOS-COMMON.
This is where two sounds blend together to form a new sound. For example, DON'T YOU becomes DONCHOU, where the T and the Y sound together become a 'CH' sound. In the same way 'DID YOU?' becomes DI-JU, where the D and the Y sound combine to become a 'J' sound.